No.
No.
No.
No.
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Every meridian of longitude is perpendicular to every parallel of latitude, and every parallel of latitude is perpendicular to every meridian of longitude.
look at a pencil. it is only hexagonal prism i can think of. bye.
The zero vector is not perpendicular to all vectors, but it is orthogonal to all vectors.
The axis of a right circular cone is perpendicular to every radius or diameter of the base.
no but sometimes yes